featherless-ai/simple-jev

Turn any open model into a classifier/jev endpoint

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Use compatible open models from huggingface, for structured classification and scoring, without training a separate classifier head. Explore the demos, playground, and documentation at simple-jev.featherless.ai. Send shared context and a set of questions. Simple Jev reads the model's next-token logits for each question and builds a JSON response containing choices, rubric scores, or truth/support judgments. The model does not generate a JSON completion: the server constructs the response from the scores. The current implementation runs locally with Hugging Face Transformers and PyTorch. Shared request validation, versioned prompt instructions, and response scoring live in the plain Python common/ folder so other inference implementations can use the same rules. Try the public demo API with no login, API key, or authentication required. The demo has a 2k-token context limit and is rate limited to 2 requests per second (2 RPS). First, list the available models with GET /v1/models: The demo already serves…

featherless-ai/simple-jev on GitHub A short preview, not the full document.

Read the full README ↗ · Preview checked 2026-09-20T07:37:41.970Z

Inside the original README — Document outline
  1. Simple Jev Project
  2. Try it today
  3. Running the HF Server
  4. How do I use the API?
  5. What is a classifier, and why “System One”?
  6. How shared prompts and prefill-only scoring reduce work
  7. Shared prompt contract and project layout
  8. Testing
  9. One more thing: Really Fancy Decision Training (RFDT)

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Documentation belongs to its respective authors. Reported project/model license: Apache-2.0. A listing is not a grant of reuse or training rights. Confirm the document’s own terms at the source.

What this repository does

Turn any open model into a classifier/jev endpoint

Repository facts

Owner
featherless-ai
Primary language
Python
Stars
417
Forks
44
Open issues + pull requests
1
License
Apache-2.0
Archived
No
Default branch
main
Created
2026-09-18T09:52:15.000Z
Last push
2026-09-21T06:25:47.000Z

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